I've already seen that someone wanted to know how to write Isaiah in Hebrew, but my question is mainly about the numbers, because I found just a few numbers, which can be written in Hebrew. I've already found the number 10, but how do you write the number 41?

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I vote to close as off topic (Hebrew language questions are not in scope). See meta.judaism.stackexchange.com/q/162/759 and the FAQ.
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Double AA♦May 30 '12 at 21:51